bjoernager/rust
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Prevent generic pattern types from being used in libstd

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This commit is contained in:
Oli Scherer 2025-02-05 11:45:50 +00:00
parent 8df89d1cb0
commit fab6d8ae8c
7 changed files with 101 additions and 11 deletions
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44
compiler/rustc_trait_selection/src/traits/wf.rs
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@ -8,8 +8,9 @@ use rustc_middle::ty::{
self, GenericArg, GenericArgKind, GenericArgsRef, Ty, TyCtxt, TypeSuperVisitable,
TypeVisitable, TypeVisitableExt, TypeVisitor,
};
use rustc_span::Span;
use rustc_session::parse::feature_err;
use rustc_span::def_id::{DefId, LocalDefId};
use rustc_span::{Span, sym};
use tracing::{debug, instrument, trace};
use crate::infer::InferCtxt;
@ -704,8 +705,47 @@ impl<'a, 'tcx> TypeVisitor<TyCtxt<'tcx>> for WfPredicates<'a, 'tcx> {
));
}
ty::Pat(subty, _) => {
ty::Pat(subty, pat) => {
self.require_sized(subty, ObligationCauseCode::Misc);
match *pat {
ty::PatternKind::Range { start, end, include_end: _ } => {
let mut check = |c| {
let cause = self.cause(ObligationCauseCode::Misc);
self.out.push(traits::Obligation::with_depth(
tcx,
cause.clone(),
self.recursion_depth,
self.param_env,
ty::Binder::dummy(ty::PredicateKind::Clause(
ty::ClauseKind::ConstArgHasType(c, subty),
)),
));
if !tcx.features().generic_pattern_types() {
if c.has_param() {
if self.span.is_dummy() {
self.tcx().dcx().delayed_bug(
"feature error should be reported elsewhere, too",
);
} else {
feature_err(
&self.tcx().sess,
sym::generic_pattern_types,
self.span,
"wraparound pattern type ranges cause monomorphization time errors",
)
.emit();
}
}
}
};
if let Some(start) = start {
check(start)
}
if let Some(end) = end {
check(end)
}
}
}
}
ty::Tuple(tys) => {